In summary, five characteristic features of Web 2.0

Collaboration, interaction, exchange and technological evolutions appear among these key-words
1. Strengthened participation of Internet users ( blogs, wiki, tags,...)

• the web becomes a social media, even citizen where everyone can be author (Wikipedia).
• Production of web contents is democratized thanks to the development of technologies: blogs, wikis, podcasts, photos and digital videos, etc), to the wide diffusion of broadband and to the emergence of a new generation of internet users native of the digital technology.

2. Abolished borders

The web 2.0 abolishes borders: sites and services are no longer isolated islets of information. They communicate and enable multiple re-combinations:

• between applications (inter-operability, applications combinations...): calendars, maps...
• between medium (computers, telephony, audio reader, video, Internet), with the advent of teh web as main channel.

3.Improvement of interfaces

Interfaces become more ergonomicthanks to the simplification of actions: fewer clicks ("slide/put down"), more comfort (automatic recording of modifications).

4. The webisation of desktop applications

Traditional apps leave local desktops to join webtops. Expl: "Office live" from Microsoft

5. An unstable sector

Sites and services refering to web 2.0 do not stop increasing. Services are free or accessible at very low cost. The great majority of corporations proposing 2.0 services have less than 24 months...